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GameScene.swift
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GameScene.swift
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//
// GameScene.swift
// Project17
//
// Created by Eren Erinanc on 18.02.2021.
//
import SpriteKit
class GameScene: SKScene, SKPhysicsContactDelegate {
var starField: SKEmitterNode!
var player: SKSpriteNode!
var scoreLabel: SKLabelNode!
var enemyCount = 0
var possibleEnemies = ["ball", "hammer", "tv"]
var gameTimer: Timer?
var timeInterval = 1.0
var isGameOver = false
var gameOverLabel: SKLabelNode!
var score = 0 {
didSet {
scoreLabel.text = "Score: \(score)"
}
}
override func didMove(to view: SKView) {
backgroundColor = .black
starField = SKEmitterNode(fileNamed: "starfield")!
starField.position = CGPoint(x: 1024, y: 384)
starField.advanceSimulationTime(10)
addChild(starField)
starField.zPosition = -1
physicsWorld.gravity = .zero
physicsWorld.contactDelegate = self
startGame()
}
func startGame() {
scoreLabel?.removeFromParent()
player = SKSpriteNode(imageNamed: "player")
player.position = CGPoint(x: 100, y: 384)
player.physicsBody = SKPhysicsBody(texture: player.texture!, size: player.size)
player.physicsBody?.contactTestBitMask = 1
addChild(player)
scoreLabel = SKLabelNode(fontNamed: "Chalkduster")
scoreLabel.position = CGPoint(x: 16, y: 16)
scoreLabel.horizontalAlignmentMode = .left
addChild(scoreLabel)
score = 0
startTimer()
}
func startTimer() {
gameTimer?.invalidate()
gameTimer = Timer.scheduledTimer(timeInterval: timeInterval, target: self, selector: #selector(createEnemy), userInfo: nil, repeats: true)
}
@objc func createEnemy() {
guard !isGameOver else { return }
guard let enemy = possibleEnemies.randomElement() else { return }
let sprite = SKSpriteNode(imageNamed: enemy)
sprite.position = CGPoint(x: 1200, y: Int.random(in: 50...736))
addChild(sprite)
sprite.physicsBody = SKPhysicsBody(texture: sprite.texture!, size: sprite.size)
sprite.physicsBody?.categoryBitMask = 1
sprite.physicsBody?.velocity = CGVector(dx: -500, dy: 0)
sprite.physicsBody?.angularVelocity = 5
sprite.physicsBody?.linearDamping = 0
sprite.physicsBody?.angularDamping = 0
enemyCount += 1
if enemyCount.isMultiple(of: 20) {
timeInterval -= 0.1
startTimer()
}
}
override func update(_ currentTime: TimeInterval) {
for node in children {
if node.position.x < -300 {
node.removeFromParent()
}
}
if !isGameOver {
score += 1
gameOverLabel?.removeFromParent()
}
}
override func touchesMoved(_ touches: Set<UITouch>, with event: UIEvent?) {
guard let touch = touches.first else { return }
var location = touch.location(in: self)
if location.y < 100 {
location.y = 100
} else if location.y > 668 {
location.y = 668
}
player.position = location
}
func didBegin(_ contact: SKPhysicsContact) {
let explosion = SKEmitterNode(fileNamed: "explosion")!
explosion.position = player.position
addChild(explosion)
player.removeFromParent()
isGameOver = true
gameOverLabel = SKLabelNode(fontNamed: "Chalkduster")
gameOverLabel.text = "Game Over"
gameOverLabel.fontSize = 100
gameOverLabel.position = CGPoint(x: 512, y: 384)
addChild(gameOverLabel)
DispatchQueue.main.asyncAfter(deadline: .now() + 2) {
let ac = UIAlertController(title: "Do you want to start a new game?", message: nil, preferredStyle: .alert)
ac.addAction(UIAlertAction(title: "New Game", style: .default) { [weak self] _ in
self?.isGameOver = false
self?.startGame()
})
ac.addAction(UIAlertAction(title: "Cancel", style: .destructive))
self.view?.window?.rootViewController?.present(ac, animated: true)
}
}
}